um: don't bother blocking SIGARLM and SIGUSR1

We used to generate those, but we hadn't done that for a long
time.  No need to bother blocking them for signal handlers.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Richard Weinberger <richard@nod.at>
diff --git a/arch/um/os-Linux/signal.c b/arch/um/os-Linux/signal.c
index 2dde9f6..75c3e9c 100644
--- a/arch/um/os-Linux/signal.c
+++ b/arch/um/os-Linux/signal.c
@@ -112,7 +112,7 @@
 void timer_init(void)
 {
 	set_handler(SIGVTALRM, (__sighandler_t) alarm_handler,
-		    SA_ONSTACK | SA_RESTART, SIGUSR1, SIGIO, SIGWINCH, -1);
+		    SA_ONSTACK | SA_RESTART, SIGIO, SIGWINCH, -1);
 }
 
 void set_sigstack(void *sig_stack, int size)